title: [Comparative study of onlay bone graft absorption of outer cortex from mandible and cranium].
abstract: OBJECTIVE
  To investigate the value of application of mandibular outer cortex as bone graft by comparing its bone absorption with cranial outer cortex.
  
  
  METHODS
  8 minitype grown-up pigs at the age of 8 - 12 months underwent surgery of taking out the same size (2.5 cm x 1.0 cm) of outer cortex from mandible and craninium. The volume of the outer cortex was measured by volume-displacement method. Then the outer cortex of mandible and cranium were onlay grafted to the each side of the pig snout, respectively. 12 weeks later, 2 pigs were randomly selected for histological examination. The other 6 pigs were killed 24 weeks after surgery for measurement of the bone graft volume and histologic examination.
  
  
  RESULTS
  The bone graft absorption rate was (41 +/- 5)% for mandibular outer cortex and (46 +/- 12)% for cranial outer cortex, showing no significant difference between them (P = 0.51). The histologic examination results also had no marked difference in the bony healing and reforming between the two graft.
  
  
  CONCLUSIONS
  Mandibular outer cortex is a good donor site for onlay bone graft in craniofacial region.
authors.affiliation: Dalian City Central Hospital, Dalian 116033, China.
authors.forename: Yan-Feng
authors.initials: YF
authors.lastname: Zhao
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
authors.forename: Xiao-Nan
authors.initials: XN
authors.lastname: Zhou
authors.forename: Yun-Fei
authors.initials: YF
authors.lastname: Hao
authors.forename: Chang-Feng
authors.initials: CF
authors.lastname: Qu
authors.forename: Hai-Feng
authors.initials: HF
authors.lastname: Li
authors.forename: Lai
authors.initials: L
authors.lastname: Gui
mesh_terms: D000818:Animals; D001860:Bone Plates; D001861:Bone Regeneration; D016025:Bone Transplantation / Q000379:methods; D005260:Female; D008297:Male; D008334:Mandible / Q000637:transplantation*; D012886:Skull / Q000637:transplantation*; D013552:Swine; D013556:Swine, Miniature